Manhole-cover.



W/EGLE. MANHOLE COVER.

APPLIOATION FILED 001 10 1906 PATENTED NOV. 5, 1907.

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W. EGLE.

MANHOLE COVER. APPLICATION FILED 00'1.10.1906.

PATENTBD NOV. 5, 1907.

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UNITED stares PATENT ormen.

WILLIAM EGLE, OF DETROIT, MICHIGAN, ASSIGNOR TO EUREKA MANUFACTURING COM- PANY, OF DETROIT, MICHIGAN, A CORPORATION.

MANHOLE-COVER.

Specification of Letters Patent;

Patented Nov. 5, 1907.

Application filed October 10. 1906- Serial No, 338.204.

To all whom it may concern:

Be it known that I, WILLIAM EGLE, a citizen of the United States, residing at Detroit, county of W ayne, State of Michigan, have invented a certain new and usei'ul Improvement in Manhole-Covers, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to man-hole covers; it has for its object an improved connection between the cover and the tank with which it is used, such connection constitutes the means by which the cover is supported when the yoke is loosened.

The structure to which this inventionparticularly applies, is the man-hole cover applied to manholes in enameled tanks in which it is especially desirable that the cover be held secure and prevented at any time from accidentally dropping upon the enamel of the tank.

The cover is heavy and used in a place where an unsecured cover is liable to slip from the' hand of a workman, and should such a heavy cover slip from the hands of a workman and strike the ordinary enameled surface of a tank, it is liable to chip or break the enamel and the tank is greatly injured, sometimes to an extent that destroys its usefulness, inasmuch as the metal from which the enamel has been broken is liable to rust, and rust injures the quality of the contents of the tank.

In the drawings:Figure 1, is a perspective of the manhole in place on the tank. Fig. 2, is a perspective showing the cover partially inserted through the man hole. Fig. 3, is a section through the hanger and the cover. Fig. 4, is a perspective of a modification. Fig. 5, is a longitudinal section of the modified form.

1 indicates a cover which is elliptical in shape and is intended to engage over an oval opening through the walls of the tank. The cover is slightly larger than the oval opening, is placed on the inside of the tank and is held in place by a yoke S, which spans the opening on the outside of the tank. The yoke is held to the cover by a screw-bolt 6, the one end of which is secured to the cover near its center point and the other end of which is screw threaded to hold a hand wheel 7, that runs onto the threads of the bolt after the yoke has been placed thereon and forces the yoke and the cover toward each other.

In order to remove the cover entirely from the opening it is necessary to loosen the yoke, swing the yoke on the pin which connects it to the cover so that it will not interfere with subsequent movement given to the cover, then turn the cover on the hinge connections to be next described until it will swing through the opening to the outside of the tank; the cover yoke and justably connecting bolt are then swung around the hinge upon the bracket 2. Nearthe end of thelong axis of the elliptical opening, a bracket 2 is secured to the tank by bolts or in any other suitable way; this bracket 2 carries a hinge pin upon which there is mounted the hinge knuckle 3 of an arm 4. The arm 4 is connected to the cover by a double joint connection in which two bolts 9 and 11 are arranged at right angles to each other so that the cover may turn with respect to the arm on both the bolts, making what is sometimes called a universal joint, and of these, the bolt 9 hinges an intermediate hinge member 10, to lugs 12 that project from the face of the cover; the bolt 11 pivots the hinge member 10 to the arm 4.

In the form shown in Figs. 1, 2 and 3, the hinge member 10 forms the base from which projects the screw bolt 6, and may be an integral part of the screw-bolt G, or made separate therefrom as may be desired. In this form the arm 4 is bent and that end of it which is in immediate connection with the member 10 lies parallel with the short diameter of the elliptical opening; this end of it also is bent toward the tank. The main body of the arm 4 from the knuckle 3 to the bend 16 is so directioned with reierence to the knuckle 3, and to the pin 11 that it assumes a position substantially parallel to the long axis of the cover when the cover is locked in place over the manhole; this shape of the hinge arm 4 allows the hand-wheel and the yoke to swing through the bend in the arm4, in making the several turns on the hinges which are necessary to move the cover and its connections.

In the form shown in Figs. 4 and 5, the arm 41 extends irom the hinge knuckle 31 at right-angles thereto and directly from the middle thereof, and is itself broken by a pivoted joint 42 intermediate the hinge end, and the connection with the cover. The end 43 connects with the cover by a double pivoted connection, one part of which turns on an axis parallel with a short axis of the cover, and another of which turns on an axis parallel with a long axis of the cover.

What I claim is:

1. In combination with a manhole cover, a yoke adengaging thereacross, a hinged supporting arm therefor, a universal joint connection between the free end of said arm and said cover and yoke, and a screw bolt engaging said cover and through said yoke whereby the cover may be drawn tightly against the complementary edge of the aperture in a wall whose closure is desired, and against whose wall portions adjacent thereto the end portions of said yoke engage, substantially as described.

2. In combination with the apertured wall of a tank, an arm hinged thereto in position to swing in front of the aperture, said arm being formed so that the portion intermediate its hinged portion and the outer end whose projection in front of the aperture is not desired is not in interfering position with the passage of an object to engage with its ends against those portions of the therezfbove and through the aperture, a man-hole cover termediate portion of the arm and through said aperture, 10

ria a yoke supported thereby, said yoke being adapted substantially as described.

In testimony whereof, I sign this specification in the walls on each side of the aperture, a universal joint presence of two witnesses.

5 connection between said yoke said cover and the outer end of the arm, and a screw bolt provided with a hand wheel whereby the cover may be drawn closely against Witnesses: the edge of the opposite face of the wall from that en- MAY E. KOTT, gaged by the yoke, and adapted to be swung; over said in CHARLES F. BURTON.

WILLIAM EGLE. 

